diff --git a/pubspec.yaml b/pubspec.yaml
index 65a272e..c6ba01c 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -8,7 +8,7 @@ description:
 homepage: https://github.com/canonical/dbus.dart
 
 environment:
-  sdk: '>=2.17.0 <3.0.0'
+  sdk: '>=2.17.0 <4.0.0'
 
 platforms:
   linux: